If water is pouring out somewhere in a Great Falls home, close the main valve; if you smell gas, leave and call 911 and Washington Gas from outside. Then call the number on this page to be connected with a local plumber in Great Falls.

When you call
The number on this page connects you with an independent plumber who takes urgent work in Great Falls. Tell them what failed, whether water is still running, and whether the main is off. Say whether the house is on a private well or Fairfax Water, and whether it's on public sewer, since that changes what the plumber brings. On large lots, give a landmark such as Georgetown Pike, Old Dominion Drive or the Village Green. Ask how after-hours pricing works. Arrival depends on the hour and distance, so none is promised.
What drives the cost
- The hour. Nights, weekends and holidays usually cost more than a weekday visit.
- Well equipment. A dead well pump, pressure tank or switch is a different job than a burst pipe, and it may need a plumber who works on wells.
- Distance and access. Long runs from the well or meter to the house, and finished lower levels, can add time.
- Permits. Fairfax County requires a permit for gas water heater and furnace replacements even when they're like-for-like.
What's different in Great Falls
Great Falls is a large-lot, partly rural community on the Potomac, and its plumbing reflects that. Many homes rely on private wells, while some neighborhoods are served by Fairfax Water (703-698-5800, with an automated after-hours option). Many homes are also not on public sewer and use a private onsite wastewater system instead. Washington Gas runs pipelines throughout the area, but not every house is connected.
That mix changes what an emergency looks like. On a well, no water at all usually points to the well pump, its pressure switch or the pressure tank, or simply a power outage, since the pump runs on electricity. A backup in a house on an onsite system may involve the line between the house and the tank, not a public sewer. For Fairfax Water homes, the homeowner owns every pipe on the property, including the line from the meter to the house.
If you smell gas, leave first, then call 911 and Washington Gas at 844-WASHGAS (844-927-4427), option 1, from outside. The median home here was built in 1985.
Checklist before help arrives
- Main valve closed; on a well, turn off the pump's breaker if water is spraying.
- Water heater gas or power off if it's leaking.
- Stop using water if drains are backing up, especially on an onsite system.
- Know where the well head, pressure tank and any cleanouts are.
- Take photos for insurance.
Emergency Plumber questions in Great Falls
Our home is on a private well and the taps stopped. Who can help?
Our house is not on municipal sewer and every drain is backing up. What now?
I smell gas near the furnace or water heater. What should I do?
We are leaving for a winter trip. How do we avoid coming home to a flood?
More plumbing services in Great Falls
Emergency Plumber nearby
Helpful guides
Sources
- Great Falls Citizens Association: water, wells and wastewater
- Fairfax Water: customer service
- Fairfax Water: your plumbing
- Fairfax County LDS: water heater and gas appliance permits
- Washington Gas: safety and emergency leak line
- Great Falls housing by year built (city-stats.com)
- Great Falls, Virginia (Wikipedia)
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